| Title |
Fault Phase Selection Algorithm using Unit Vector of Sequence Voltages for Transmission Line Protection |
| Authors |
이명수(Lee, Myeong-Su) ; 이재규(Lee, Jae-Gyu) ; 김수남(Kim, Su-Nam) ; 유석구(Yu, Seok-Gu) |
| Keywords |
Transmission line protection ; phase selection ; positive-sequence voltage ; negative-sequence voltage |
| Abstract |
A reliable fault phase selection algorithm plays a very important role in transmission line protection, Particularly in Extra High Voltage (EHV) networks. The conventional fault phase selection algorithm used the phase difference between positive and negative sequence current excluding load current. But, it is difficult to pick out only fault current since we can not know when a fault occurs and select the fault phase in weak-infeed conditions that dominate zero-sequence current in phase current. The proposed algorithm can select the accurately fault phase using the sum of unit vectors which are calculated by positive-sequence voltage and negative-sequence voltage. |